The mol&shy;ecular structure of the title energetic compound, C8H6N4O8, is composed of two planar isoxazole rings and two near planar alkyl-nitrate groups (r.m.s deviation = 0.006&#8197;&Aring;). In the crystal, the mol&shy;ecule sits on an inversion center, thus Z&prime; = 0.5. The dihedral angle between the isoxazole ring and the nitrate group is 69.58&#8197;(8)&deg;. van der Waals contacts dominate the inter&shy;molecular inter&shy;actions. Inversion-related rings are in close slip-stacked proximity, with an inter&shy;planar separation of 3.101&#8197;(3)&#8197;&Aring; [centroid&ndash;centroid distance = 3.701&#8197;(3)&#8197;&Aring;]. The measured and calculated densities are in good agreement (1.585 versus 1.610&#8197;Mg&#8197;m&minus;3).

The mol&shy;ecular structure of the title energetic compound, C8H6N4O8, is composed of two planar isoxazole rings and two near planar alkyl-nitrate groups (r.m.s deviation = 0.006&#8197;&Aring;). In the crystal, the mol&shy;ecule sits on an inversion center, thus Z&prime; = 0.5. The dihedral angle between the isoxazole ring and the nitrate group is 69.58&#8197;(8)&deg;. van der Waals contacts dominate the inter&shy;molecular inter&shy;actions. Inversion-related rings are in close slip-stacked proximity, with an inter&shy;planar separation of 3.101&#8197;(3)&#8197;&Aring; [centroid&ndash;centroid distance = 3.701&#8197;(3)&#8197;&Aring;]. The measured and calculated densities are in good agreement (1.585 versus 1.610&#8197;Mg&#8197;m&minus;3).